Susan C. Levine - The University of Chicago
Biography, courses, and more about Levine, the co-director of the Center for Early Childhood Research. Her freely downloadable articles include "Early puzzle play: A predictor of preschoolers' mental rotation skill"; "The role of parents and teachers
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Zoltan Dienes' Web Site - Zoltan Dienes
"Math through play" from a developer of psychomathematics, multi-base blocks, and the six-stage theory of learning mathematics. Freely download PDFs of Dienes' Ruritania stories and math games such as Strip Mathematics, Circular Villages, Six Stages with
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